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參數(shù)資料
| 型號： | LTC1708-PG |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck Regulator Controller |
| 中文描述： | 可調(diào)式雙5位VID高效率，2相電流模式同步降壓穩(wěn)壓控制器 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大小： | 358K |
| 代理商： | LTC1708-PG |
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1
LTC1708-PG
Dual Adjustable 5-Bit VID
High Efficiency, 2-Phase Current Mode
Synchronous Buck Regulator Controller
February 2000
Figure 1. High Efficiency VID Controlled, 2-Output Step-Down Converter
I
Out-of-Phase Controllers Reduce Input Capacitance
and Power Supply Induced Noise
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Power Good Output Monitors Both Outputs
I
5-Bit Mobile VID Control, V
OUT
: 0.9V to 2.0V
I
Dual N-Channel MOSFET Synchronous Drive
I
±
1% Output Voltage Accuracy
I
DC Programmed Fixed Frequency 150kHz to 300kHz
I
Wide V
IN
Range: 3.5V to 36V Operation
I
Very Low Dropout Operation: 99% Duty Cycle
I
Adjustable Soft-Start Current Ramping
I
Foldback Output Current Limiting
I
Latched Short-Circuit Shutdown with Defeat Option
I
Output Overvoltage Protection
I
Remote Output Voltage Sense
I
Low Shutdown Current: 20
μ
A
I
5V and 3.3V Standby Regulators
I
Selectable Constant Frequency, Burst Mode
TM
and
Continuous Operation
APPLICATIU
The LTC
1708 is a dual adjustable 5-bit VID program-
mable step-down switching regulator controller that drives
all N-Channel power MOSFET stages. A constant fre-
quency current mode architecture allows adjustment of
the frequency up to 300kHz. Power loss and noise due to
the ESR of the input capacitance are minimized by oper-
ating the two main controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The precision 0.8V reference is compat-
ible with future microprocessor generations, and a wide
3.5V to 30V (36V maximum) input supply range that
encompasses all battery chemistries. A power good out-
put indicates when the output voltages are within 7.5% of
their programmed value.
A RUN/SS pin for each controller provides both soft-start
and an optional timed, short-circuit shutdown. Other
protection features include: internal foldback current lim-
iting and an output overvoltage crowbar. The force con-
tinuous control pin (FCB) can be used to inhibit Burst
Mode operation or to regulate a third, flyback output.
I
Notebook and Palmtop Computers, PDAs
I
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
+
4.7
μ
F
D3
D4
D1
M2
5 VID BITS
M1
C
B1
0.47
μ
F
1000pF
L1
1
μ
H
C
1500pF
R
C1
22k
1
μ
F
CERAMIC
C
IN
10
μ
F
50V
CERAMIC
×
4
2.2
μ
H
C
OUT1
270
μ
F
2V
SP
×
4
C
OUT1a
10
6.3V
CERAMIC
R
0.003
V
0.925V TO
2.00V
14.1A
D2
M3b
M3a
C
B2
0.1
μ
F
R4
63.4k
1%
L2
C
C2
220pF
1000pF
+
C
OUT
180
μ
F
4V
SP
R
SENSE2
R3
20k
1%
R
C2
15k
V
OUT2
1.5V
4A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
VID0 TO VID4
PGND
SENSE1
+
SENSE2
+
SENSE1
–
SENSE2
–
PGOOD
ATTNIN
V
OSENSE2
I
TH1
RUN/SS1
I
TH2
V
IN
VIDV
CC
INTV
CC
RUN/SS2
SGND
V
4.75V TO 28V
M1: IRF7811
M2: 1RF7809
M3a, M3b: FDS6982
L1: VISHAY 5050CE
ATTNOUT CONNECTED TO EAIN1
1628 F01
C
SS1
0.1
μ
F
C
SS2
0.1
μ
F
LTC1708-PG
+
DESCRIPTIOU
FEATURES
TYPICAL APPLICATIO
U
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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| LTC1709EG | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1709EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1709EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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